Materials / Compare
Magnesium AZ31B-H24 vs. Zinc Zamak 3
Compare Magnesium AZ31B-H24 vs. Zinc Zamak 3 strength, stiffness, weight and thermal properties.
| Try it on a partA bracket to run stress or thermal on, free in your browser | Open in LessCAD | Open in LessCAD |
|---|---|---|
| Mechanical | ||
| Yield strength | 220MPasourcetypical, H24, 0.5-6 mm, 0.2 % proof stress | 221MPasourcetypical |
| Ultimate tensile strength | 290MPasourcetypical, H24, 0.5-6 mm | 283MPasourcetypical |
| Elongation at break | 13%sourcetypical, H24, 0.5-6 mm, gauge 5.65√A | 10%sourcetypical, in 2 in. |
| Young's modulus (stiffness) | 44.8GPasourcetypical (handbook physical constant) | 85.5GPasourcetypical |
| Density | 1,769kg/m³sourcenominal | 6,600kg/m³sourcetypical |
| Strength to weight | 124kN·m/kg3.71x higher | 33.5kN·m/kg |
| Stiffness to weight | 25.3MN·m/kg1.95x higher | 13MN·m/kg |
| Poisson's ratio | 0.35sourcetypical (handbook physical constant) | 0.27sourcetypical, Zamak 3 hot-chamber die cast |
| Shear modulus | 16.6GPa | 33.7GPa2.03x stiffer in shear |
| Bulk modulus | 49.8GPa | 62GPa |
| Speed of sound | 5,032m/s | 3,599m/s |
| Thermal | ||
| Thermal conductivity | 76.9W/m·Ksourcetypical (temper/temperature not stated) | 113W/m·Ksourcetypical |
| Thermal expansion | 26.8µm/m·Ksourcetypical (temperature range not stated) | 27.4µm/m·Ksourcetypical |
| 100 mm part over a 50 °C swing | 134µm growth2% less | 137µm growth |
| Specific heat | 1,040J/kg·Ksourcetypical | 419J/kg·Ksourcetypical |
| Heats up and cools (diffusivity) | 41.8mm²/s2% faster | 40.9mm²/s |
| Thermal shock resistance | 9,159W/m18% more resistant | 7,782W/m |
| Melting point | not sourced | 381–387°Csourcemelting range |
| Max service temperature | 149°Csourcestated application limit | not sourced |
| Values for | AZ31B-H24 sheet 0.016-0.062 in., MIL-HDBK-5J Table 4.2.1.0(b) (AMS 4377); strengths are S-basis MINIMUMS | Zamak 3 (ASTM B86 die cast), Nathan Trotter (zinc alloy producer) technical data sheet, typical values |
Every value links to the document that states it. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
Questions
Is Magnesium AZ31B-H24 stronger than Zinc Zamak 3?
Zinc Zamak 3 is stronger: its yield strength is 221 MPa against 220 MPa for Magnesium AZ31B-H24 (0%).
Which is lighter, Magnesium AZ31B-H24 or Zinc Zamak 3?
Magnesium AZ31B-H24 is lighter: 1,769 kg/m³ against 6,600 kg/m³ for Zinc Zamak 3.
Which is stiffer, Magnesium AZ31B-H24 or Zinc Zamak 3?
Zinc Zamak 3 is stiffer: Young's modulus 85.5 GPa against 44.8 GPa for Magnesium AZ31B-H24, so the same part in Zinc Zamak 3 deflects less under the same load.
Which is lighter for the same job, Magnesium AZ31B-H24 or Zinc Zamak 3?
For the same stiffness or strength: Magnesium AZ31B-H24 is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate, strong rod or tie, strong beam, strong panel or plate.
| Part that must be | Magnesium AZ31B-H24 | Zinc Zamak 3 |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 1.95x heavier |
| Stiff beam (bending) | lighter | 2.7x heavier |
| Stiff panel or plate | lighter | 3.01x heavier |
| Strong rod or tie | lighter | 3.71x heavier |
| Strong beam | lighter | 3.72x heavier |
| Strong panel or plate | lighter | 3.72x heavier |
For the same stiffness or strength, mass scales with density over stiffness (or strength) raised to a power set by how the part is loaded: 1 for a rod in tension, 1/2 for a beam in bending, 1/3 for a panel (the standard material-selection indices).
Which conducts heat better, Magnesium AZ31B-H24 or Zinc Zamak 3?
Zinc Zamak 3 conducts heat better: 113 W/m·K against 76.9 W/m·K for Magnesium AZ31B-H24.
Which expands less with temperature?
Magnesium AZ31B-H24 expands less: 26.8 µm/m·K against 27.4 µm/m·K for Zinc Zamak 3.